Broadstrike
An us quarter error coin that is classified as a broadstrike is a coin that has been struck by it's appropriate die while the die collar was missing. The die collar holds the blank or planchet in place.

Broadstrike coins are wider than the regular coin . Without the collar to hold the metal in place the metal spreads out further than it is supposed to. These error coins are a great addition to any coin collection. Notice how much wider the Washinton is in the image below. It is a perfect example of a broadstrike coin.